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Angular2使用SVG自定义图表（条形图、折线图）组件示例

2019年07月18日  | 移动技术网IT编程  | 我要评论

本文实例讲述了angular2使用svg自定义图表（条形图、折线图）组件。分享给大家供大家参考，具体如下：

要求：用户将数据作为参数传进来，通过类型决定渲染何种类型的图标。

demo：

html:

<ngo-chart [inputparams]="options"></ngo-chart>

ts:

 options = {
    type: 'line',   //图表类型
    xaxis: {      //x轴的数据
      data: ['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun']
    },
    yaxis: {      //x轴的数据
      data: [120, 220, 150, 111, -150, 55, 60],
    },
    width: 600,    //宽
    height: 500,    //高
    datapadding: 8   //条形图之间的距离
  };

效果：

源代码：

import {
  input,
  oninit,
  viewchild,
  component,
  viewencapsulation,
  elementref,
  afterviewinit,
  changedetectorref,
} from '@angular/core';
import { ngochartsvgparams, scale, axis, chart } from './chart-svg-params';
@component({
  selector: 'ngo-chart-svg',
  templateurl: './chart-svg.html',
  styleurls: ['./chart-svg.scss'],
  encapsulation: viewencapsulation.native
})
export class ngochartsvg implements oninit, afterviewinit {
  @input() inputparams: ngochartsvgparams;
  @viewchild('svg') svg: elementref;
  @viewchild('polyline') polyline: elementref;
  params: ngochartsvgparams;
  axisy: axis; // y轴
  axisx: axis; // x轴
  valuetopxratio: number; // 值转px的比率
  y0: number; // 坐标轴 (0,0)的y轴
  yscale: array<scale> = []; // y轴刻度值
  xscale: array<scale> = []; // x轴刻度值
  xgapwidth: number; // x轴刻度之间的间隙宽度
  data: array<chart> = [];
  color: string;
  type: string;
  polylinepoints: string;
  polylinelength: number;
  constructor(
    private ele: elementref,
    private cd: changedetectorref
  ) { }
  ...
 ngoninit() {
    this.initparams();
    const svg = this.svg.nativeelement;
    const _width = this.params.width;
    const _height = this.params.height;
    svg.setattribute('width', _width);
    svg.setattribute('height', _height);
    // 绘制 y轴
    this.drawaxisy();
    this.drawscaley();
    // 绘制 x轴
    this.drawaxisx();
    this.drawscalex();
    this.drawrect();
    if (this.params.type === 'line') {
      this.drawline();
    }
  }
  ngafterviewinit() {
    if (this.polyline) {
      this.polylinelength = this.polyline.nativeelement.gettotallength();
      this.cd.detectchanges();
    }
  }
}

html

<svg #svg>
  <!-- y轴 -->
  <g>
    <line [attr.x1]="axisy.x1" [attr.y1]="axisy.y1+15" [attr.x2]="axisy.x2" [attr.y2]="axisy.y2" [attr.stroke]="color" [attr.fill]="color"
      style="stroke-width:3" />
    <polygon [attr.points]="axisy.arrow" />
    <ng-container *ngfor="let scale of yscale">
      <line class="dash" [attr.x1]="scale.x1" [attr.x2]="scale.x2" [attr.y1]="scale.y1" [attr.y2]="scale.y2" stroke="rgba(0,0,0,0.3)"
      />
      <text class="_label" [attr.x]="scale.x1-5" style="text-anchor: end" [attr.y]="scale.y1" [attr.fill]="color" [attr.fill]="color">{{scale.label}}</text>
    </ng-container>
  </g>
  <!-- x轴 -->
  <g>
    <line [attr.x1]="axisx.x1-15" [attr.x2]="axisx.x2" [attr.y1]="axisx.y1" [attr.y2]="axisx.y2" [attr.stroke]="color" [attr.fill]="color"
      style="stroke-width:3" />
    <polygon [attr.points]="axisx.arrow" />
    <ng-container *ngfor="let scale of xscale">
      <line [attr.x1]="scale.x1" [attr.x2]="scale.x2" [attr.y1]="scale.y1" [attr.y2]="scale.y2" [attr.stroke]="color" [attr.fill]="color"
        style="stroke-width:1" />
      <text class="_label" [attr.x]="scale.x1-xgapwidth/2" [attr.y]="axisy.y1+15" [attr.fill]="color" style="text-anchor: middle;">{{scale.label}}</text>
    </ng-container>
  </g>
  <!-- 矩形 -->
  <ng-container *ngif="type==='bar'">
    <text x="10" y="20" fill="red">bar</text>
    <g>
      <ng-container *ngfor="let item of data">
        <ng-container *ngif="item.value<=0">
          <rect class="_rect" [attr.x]="item.x" [attr.y]="item.y" [attr.width]="item.w" [attr.height]="item.h" fill="color">
            <animate attributename="height" [attr.from]="item.h*0.6" [attr.to]="item.h" begin="0s" dur="1.1s" />
          </rect>
          <text [attr.x]="item.x+item.w/2" [attr.y]="item.y+item.h-5" fill="white" style="text-anchor: middle;">{{item.value}}</text>
        </ng-container>
        <ng-container *ngif="item.value>0">
          <rect [attr.x]="item.x" [attr.y]="item.y" [attr.width]="item.w" [attr.height]="item.h" fill="color">
            <animate attributename="y" [attr.from]="item.y+item.h*0.4" [attr.to]="item.y" begin="0s" dur="1.1s" />
            <animate attributename="height" [attr.from]="item.h*0.6" [attr.to]="item.h" begin="0s" dur="1.1s" />
          </rect>
          <text class="_label" [attr.x]="item.x+item.w/2" [attr.y]="item.y+18" fill="white" style="text-anchor: middle;">{{item.value}}
            <animate attributename="opacity" from="0" to="1" begin="0s" dur="1.1s" />
          </text>
        </ng-container>
      </ng-container>
    </g>
  </ng-container>
  <!--折线 -->
  <ng-container *ngif="type==='line'">
    <text x="10" y="20" fill="red">line</text>
    <g>
      <polyline #polyline class="_polyline" [attr.points]="polylinepoints" fill="none" [attr.stroke]='color' [attr.stroke-dasharray]="polylinelength"
        [attr.stroke-dashoffset]="polylinelength" />
      <ng-container *ngfor="let item of data">
        <circle [attr.cx]="item.x+item.w/2" [attr.cy]="item.y" r="2" [attr.fill]="color" [attr.stroke]='color' />
        <text class="_label" [attr.x]="item.x+item.w/2" [attr.y]="item.y+20" fill="white" style="text-anchor: middle;">{{item.value}}
          <animate attributename="opacity" from="0" to="1" begin="0s" dur="1.1s" />
        </text>
      </ng-container>
    </g>
  </ng-container>
</svg>

css

svg {
 background: rgba(0, 0, 0, 0.2);
 border: 1px solid black;
}
svg * {
 position: static;
 font-size: 16px;
}
._polyline {
 fill: none;
 animation: linemove 1.5s ease-in-out forwards;
}
@keyframes linemove {
 to {
  stroke-dashoffset: 0;
 }
}

一、初始化参数

//首先获取传入的参数
 @input() inputparams;
//初始化
 const _params: ngochartsvgparams = {
   xaxis: this.inputparams.xaxis,
   yaxis: this.inputparams.yaxis,
   type: this.inputparams.type ? this.inputparams.type : 'bar',
   width: this.inputparams.width ? this.inputparams.width : 700,
   height: this.inputparams.height ? this.inputparams.height : 500,
   datapadding: this.inputparams.datapadding !== undefined ? this.inputparams.datapadding : 8,
   yscaleno: this.inputparams.yscaleno >= 3 ? this.inputparams.yscaleno : 6,
};
this.color = 'black';
this.type = _params.type;
this.params = _params;

二：绘制坐标轴y轴

const _height = this.params.height;
const _pad = this.params.padding;
const _arrow = _pad + ',' + (_pad - 5) + ' ' + (_pad - 6) + ',' + (_pad + 12) + ' ' + (_pad + 6) + ',' + (_pad + 12);
 this.axisy = {
   x1: _pad,
   y1: _height - _pad,
   x2: _pad,
   y2: _pad,
   arrow: _arrow
};

三、绘制y轴的刻度

const _height = this.params.height;
const _width = this.params.width;
// 显示label的边距
const _padding = this.params.padding;
const _ydata = this.params.yaxis.data;
// 显示的刻度数
const _yscaleno = this.params.yscaleno;
const _datamax = this.getminandmaxdata(_ydata).datamax;
const _datamin = this.getminandmaxdata(_ydata).datamin;
let _yminvalue;
let _ygapvalue;
if (_datamin < 0) {
   _ygapvalue = math.ceil((_datamax - _datamin) / (_yscaleno) / 10) * 10;
   _yminvalue = math.floor(_datamin / _ygapvalue) * _ygapvalue;
} else {
   _ygapvalue = math.ceil((_datamax) / (_yscaleno) / 10) * 10;
   _yminvalue = 0;
}
// y轴坐标点
const _y2 = this.axisy.y2;
const _y1 = this.axisy.y1;
const _x1 = this.axisy.x1;
// y轴刻度的间隙宽度
const _ygapwidth = (_y1 - _y2) / (this.params.yscaleno);
this.valuetopxratio = _ygapvalue / _ygapwidth;
// 坐标轴（0,0）的y轴坐标
const _y0 = _y1 - math.abs(_yminvalue / this.valuetopxratio);
this.y0 = _y0;
for (let i = 0; i < this.params.yscaleno; i++) {
   const _obj: scale = { x1: 0, x2: 0, y1: 0, y2: 0, label: '', value: 0 };
   _obj.x1 = _x1;
   _obj.y1 = _y1 - _ygapwidth * i;
   _obj.x2 = _x1 + _width - 2 * _padding;
   _obj.y2 = _y1 - _ygapwidth * i;
   _obj.label = _yminvalue + _ygapvalue * i;
   this.yscale.push(_obj);
}

四、绘制x坐标轴

const _width = this.params.width;
// 显示label的边距
const _pad = this.params.padding;
const _x2 = _width - _pad;
const _y2 = this.y0;
const _arrow = (_x2 + 5) + ',' + _y2 + ' ' + (_x2 - 10) + ',' + (_y2 - 6) + ' ' + (_x2 - 10) + ',' + (_y2 + 6);
this.axisx = {
  x1: _pad,
  y1: _y2,
  x2: _x2,
  y2: _y2,
  arrow: _arrow
};

五、绘制x轴刻度

const _width = this.params.width;
const _xdata = this.params.xaxis.data;
const _ydata = this.params.yaxis.data;
const y0 = this.y0;
const _x1 = this.axisx.x1;
const _x2 = this.axisx.x2;
const xgapwidth = ((_x2 - _x1) / (this.params.xaxis.data.length + 1));
this.xgapwidth = xgapwidth;
for (let i = 0; i < _xdata.length; i++) {
   const _obj: scale = { x1: 0, x2: 0, y1: 0, y2: 0, value: 0, label: '' };
   _obj.y1 = y0;
   _obj.y2 = y0 + 5;
   _obj.label = _xdata[i];
   _obj.value = _ydata[i];
   _obj.x1 = _x1 + xgapwidth * (i + 1);
   _obj.x2 = _x1 + xgapwidth * (i + 1);
   this.xscale.push(_obj);

六、绘制矩形

const _value = this.params.yaxis.data;
const _datapadding = this.params.datapadding;
const _xgapwidth = this.xgapwidth;
for (let i = 0; i < _value.length; i++) {
   const element = _value[i];
   const _obj: chart = { x: 0, y: 0, w: 0, h: 0, value: 0 };
   _obj.w = _xgapwidth - 2 * _datapadding;
   _obj.x = this.xscale[i].x1 - _obj.w - _datapadding;
   _obj.h = math.abs(this.xscale[i].value / this.valuetopxratio);
   _obj.value = this.xscale[i].value;
   if (this.xscale[i].value >= 0) {
      _obj.y = this.y0 - (this.xscale[i].value) / this.valuetopxratio;
   } else {
      _obj.y = this.y0;
   }
      this.data.push(_obj);
   }
}

七、绘制折线

const _data = this.data;
let _str = '';
_data.foreach(ele => {
if (ele.value < 0) {
   ele.y = ele.y + ele.h;
}
   _str += (ele.x + ele.w / 2) + ',' + ele.y + ' ';
});
this.polylinepoints = _str;

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